Oil pump



' July 6,1926. 1,591,313

F. G. HOLLAND OIL PUMP Filed April 25, 1925 Gtfozum top thereof Vwith radial Ylianges 24 and 25 which are inthe path of th'e'movement of the projecting part 26 of the crank 23.

The flanges 24 and 25 serve to limit the angular movement of the piston and kone of 'these flanges is provided with a set screw 27 vwhich may be adjusted to regulate the exder and the 'piston shaft 2O there is provided a partition member'28 whichis substantially T shaped in vcross section havinga web .29

and ahead portion with side flanges 30.

` The head portion of the partition member Cil fits the inner surface of the Vcylinder and the innervv edge ofthe web 29y fits the cylindricalV surface ofthe shafty 20. Openings 31 "are provided through the flanges 30 of the head and' these openings are adapted to register with the discharge openings' 16 of the cylinder. The partition member is secured in place within the cylinder by means of a bolt 33 extending Vdownwardly through the central boss 15, Ainthe top of the casting and into the partition member 28 at' the center thereof. The bolt 38 also serves to hold a sheet metal cage 34 for retaining the check valve balls 17, the cage 34 consisting of a flat sheet metal plate clamped upon the upper fend ofthe boss bythe head of the bolt 83 and having side flanges 85 which extend'downwardly on opposite.

sides of each'ofthe balls.

At the inner ends of the web 29, the sides.

thereof taper inwardly and lie in radial planes andthe outer edges of the Vflanges 80 lie in the same radial planes as ythe tapered sides of the web. The rpartition member 28 is inthe form of a sector of 'a cylindrical annulus having a bearing surface 37 at the inner 'edge of the .web which is Yof the saine angularextent as the bearing surface of the head engaging the cylinder wall. rljhe web 29 has a longitudinally extending slot 38 in rwhich is mounted packing strip 39 which engages the piston shaft 2O tl'iroughout the length of the cylindeiymthe packing being pressed against the shaft by meansof an arched spring 40 interposed between the bottom Vof the slot 38 and the inner edge ofthe packing strip. The parti'- ftion member 28 is of the saine length as the cylinder and alits between the heads 18 and .lilithe ends of the 'partition 'member 28 :being provided with grooves/ll adapted to receive lthe packing strips against which the Vbers may be cut. to provide triangular openings 43 extendheads 18 and 19 areclamped to prevent leakage of liquidV past the endsy of the partition members. Y Y

- It is exceedingly diiiicult to accurately machine a segment of a cylindrical surface and the configuration of the partition meinbere 28 which has the form of a sector of cylindrical annulus is quite important, since a number of such partition members maybe 'n cut from a cylindrical casting in which the cylindrical surfaces haveV been machined prior tothe cuttingup of thecasting to form, the partitionmembers. Figs..8 and 9 ofthe drawing show a cylindrical casting 42 from which fourof the partition mem- The casting' 42 isk cored ing endwise through the same and-with an axial opening 44 Vwhich has radially projecting slots which form the packing grooves 88. The casting`A 42 is also cored to provide the openings 31 through the heads of the partition members andthe packing groves 41 at the'ends thereof. Eachquarter of the casting 42 forms one partition member 28 the webs 29 being formed between 1 adjacent openings 43 and the casting being cut along diametrical planeswhich extend centrally through the openings 43 to provide flanges 3() extending in opposite directions from the web. The outer cylindrical surface of the casting 42 can be readily turnedto the exact diameter of the cylinder and the central opening 44can .be easily machined to a size such that the pistonshaft tight Alit therein. A u Y The piston shaft 2O-Vhas fixed thereto a vane 45which has a close lit within' the peipheral and end walls of the pumpchamier.

tached thin plates 49 which are of greater Y 20 will havel a rThe vane v'45 is securedr within a ra-` dial slot 46 cut in the .shaft 2O by means'of llO width and length than the plate 48and` r project behind the `outer and side edgesof said plate forming a groove along the outer and side vedges of the vane adapt-ed to receive the packing strips.

lVithin this groove L shaped, packing strips 50 are mounted, Y

these strips being arranged in pairs side'by side with'one armfof the L extending along a side of the vane and the other arm extending along vthe outer edge of the vane. arms of the stripsof the two pairs which extend along the outer edge ofthe vane are of different lengths and 'the inner-endsof the arms of the two pairs abut at offset points between the opposite ends of thev vane, the abutting ends of the strips being stepped toA provide shouldered joints 51 and 52. i

The body plate 48 is provided With hatches 53 vthe pp iwstesle and outer' The ' Vtending fromfthe inlet around ,the bore on ing a tubular extension forming an inlet conduit-.at its lower end and passages exopposite sides thereof communicating with the bore in theV two upper quadrants thereof, said castinghaving provisions at its upper end for vattachment of a discharge conduit, and discharge openings adjacent the inlet openings and adapted to communicate with the outlet conduit, heads closing the opposite ends of the bore, an oscillating piston come prising a shaft journaled centrally in the heads and projecting beyond one of them and a vane secured to the shaft and having packing strips engaging the cylindrical wall and heads of the casing yto provide a iuid tight engagement` with the heads and bore, a partition meinbersecured to the casting within the bore between the top thereof and the shaft, said partition member having a fluid tight engagement with the heads and cylindrical wall of the chamber, a packing strip carried by the partition member and engaging the shaft, and check valves controlling the inlet passages and outlet open-y ings. Y v

G. In anoscillating piston pump,fa piston comprising a shaft havingca vane secured thereto said vane having a groove along its outer edge and along its side edges, L shaped packing strips fitting in said groove, said strips having arms extending Yalong the sides of the vane to the shaft and arms extending alongcthe outer edge thereof, said last men-ll tionedarms having stepped ends whichv abut, andsprings interposed between the body of the vane and the inneredges of the packing c strips at the sides and at the outeredges of the vane. v

f 7. In an oscillating piston pump, a ypiston Y comprising a shaft having a longitudinal groove, a vane having its innerV end seatedl in vsaid/groove and fixed tothe shaft, said' vane having a flat .bodypor'tion and flat Vplates secured to opposite faces ofthe body portion and projecting beyond the side Vand louter edges Vthereof to Vprovide a packing groove, two pairs of L shaped packing strips arranged side by side in the groove, one pair rhaving Yarms extending along one side edge of the vane and arms of different lengths exs tending along the outer edge thereof, the

other pair of packing strips having arms exv tending along thefopposite side edge of the vane and arms extending along the outer edge thereof and abutting the ends of the first mentioned strips, and springs interposed between the side and outer edges of the body portion and the inner edgesof the strips.

'8. A partit-ion member for the cylindercof a pump of the oscillating piston type comprising a substantially T shaped member having a flanged head the outer surfaceof which isi machined to fit within a cylindrical surface anda web, the inneredge of which tapering sides lying in radialplanes and the i iianges of the head having edges in the planes of said tapering sides, the flanges of the head having openings adapted to register with disch arge opening through the cylinder wall.

9. A partition vmember for the cylinder of a pump of the oscillatoryV piston type comprising a member in the form ofa sector ofy a cylindrical annulus, theV outer'surface of said member being Vadapted to conform to the inner surface of the cylinder and the inner surface thereof being adapted to conform to the surface of the'pistonshaft, the sides of said member being recessed to pro? 'vide an outer flanged head and an inwardly with the cylindrical andA end walls of the.`

chamber, said partition member `having a groove along its inner edge, a packing strip in said groove, means for yieldingly pressing said strip against the shaft, a vane carried by said shaft, said vane having its outer and endA edges grooved, packing in the grooved edges of said vane, means for yield-' ingly pressing said packing into engagement with the cylindrical and end walls of the chamber, and valve controlledrinlet and outlet passages communicating with said cham-r ber on opposite sides ofthe ber and adjacent thereto.

11. A measuring pump comprisinga cylindrical pump chamber, heads closingV the ends of the chamber, V,a shaft extending axially throughthechamber and journaled in the heads, said shaft having a groove extending longitudinally thereof,'a partition member Ahaving a ,fluid tight engagement ner edge, a packing strip in said groove, a

spring in the groove for pressing said pack ing strip against the shaft, a vane securedl partitionk inemrwith the cylindrical wall and heads, 'said pan tition member` having a groove along its invane, said strips at the side edges of the vane Y extending intoY ther groove of thefshaft,

springs for'pressing said strips toward thef cylindrical wall and heads, and valve con-vv trolled inlet and outlet passages communicating with said chamber on oppositelsides. of the partition member and adjacent thereto.

12. In an oscillatingrpiston` pump, a piston comprising ashaft having a longitudinal swore e alle harias .its inserted Seated in f said groove and fixed to the shaft, said vane y `ingstepped ends vwhich aiout, and springs in.-

having a groove extending long the outer terposed between the body of thievane and .10.- edge and along the' sideledges thereof5v L the inner edges ofthe packing strips the vshaped packing strips fitting in said groove, sides and at the youter edges of thevne.

siiid'stripsr havingerms extending along the v d In testimony whereof@ hereunto Va'ii'ixniy sides of thevane into the 'groove of thejshafty signature. Y l* I 1 n and arms extending yalong the outer edges of the vane, said last mentioned arms havi FRANK G. HOLLAND. 

